Two equal resistance at `0^(@)C` with temperature coefficient of resistance `alpha_(1)` and `alpha_(2)` joined in series act as a single resistance in a circuit the temperature coefficient of their single resistance will be

Answer

`44.25 m`

Explanation

`COLM : 1 xx v_(1) + 4 xx v_(2) = 5 xx 20 cos 60^(@) = 50` …(i)

`COME rArr (1)/(2) xx 1 xx v_(1)^(2) + (1)/(2) xx 4 xx v_(2)^(2)`
`= [(1)/(2) 5 xx (10)^(2)] xx 2` …..(ii)
`rArr v_(1) = -10` or `m//s` & `v_(2) = 15` or `5 m//s`
`rArr Deltav = 25 m//s`
Time to fall down to ground `= sqrt((2h)/(g))= (sqrt3)/(0.98)sec`
`:.` Separation between particles `= Deltav.t = 44.2 m`